The levels, sources and atmospheric photochemical processes of amino acids in PM2.5 in forest areas
ZHU Yu-wen1,2, ZHU Ren-guo2, FANG Xiao-zheng2, PAN Yuan-yuan2, WEN Ze-qun3
1. School of Earth Sciences, East China University of Technology, Nanchang 330013, China; 2. Jiangxi Province Key Laboratory of the Causes and Control of Atmospheric Pollution, East China University of Technology, Nanchang 330013, China; 3. Department of Earth Sciences, Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650021, China
Abstract：In this study, PM2.5 samples were collected in a forest area of Nanchang (28.75°N, 115.71°E) in spring, The concentrations of combined amino acids (CAAs), free amino acids (FAAs) and the nitrogen isotopes of glycine (Gly) were determined. The result showed that the concentrations of total CAAs and the concentrations of total FAAs were 272.8~4761.5pmol/m3, and 56.4~494.0pmol/m3in the atmospheric aerosols, respectively. The fractional percentage of CAAs, Pro, Gly, Glu, Leu and Ala in the total CAAs were (19.5 ±12.0)%, (19.4 ±10.6)%, (15.3 ±4.9)%, (12.8 ±5.4)% and (9.1 ±1.6)%, respectively. Gly was the most abundant amino acid, accounting for (71.1 ±9.2)% of the total FAAs. However, the fractional percentage of other FAAs was very small (proportion range of 0.1%~14.3%). The proportion of neutral amino acids was much higher in FAAs than that in CAAs, which might be related to the photochemical reaction during long-distance transport. According to the correlations between amino acid and O3, NO2 and temperature, we found that the formation of FAAs was associated with atmospheric photochemical processes and thermal reactions in the forest areas. The δ15NC-Glyvalue (-1.0‰~+17.5‰) and δ15NF-Gly value (-5.5‰~+13.0‰) in aerosol were close to the δ15NGly value from soil sources, indicating that the main source of amino acids in PM2.5 might be from soil emission in the forest areas.
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